International law — Relation to municipal law — Treaty containing prohibition of discriminatory trade practices in contracts between individuals — Contract between individuals violating prohibition contained in treaty — Whether parties to contract entitled to rely on invalidity or partial invalidity of contract by reason of violation of treaty — Treaty establishing European Coal and Steel Community, 1951 — The law of Germany.

Treaties — Operation of — Contract between individuals violating prohibition contained in treaty — Whether parties to contract entitled to rely in proceedings before municipal court on invalidity or partial invalidity of contract by reason of violation of treaty — Treaty establishing European Coal and Steel Community, Article 60 — The law of Germany.

Treaties — Special kinds of — European Coal and Steel Community Treaty, 1951 — Treaty prohibiting discriminatory trade practices in contracts between individuals — Contract between individuals violating prohibitory provisions of Treaty — Whether parties to contract entitled to rely on invalidity or partial invalidity of contract by reason of violation of Treaty — The law of Germany.